Parsing of these two needed, please:-
15Down - "Crows' weekend spent on treetop in
this?" (R-O-T). Answer must be ROOST
but can't see where the weekend comes
in - and why crows particularly?
21Down - "Turn out Wimbledon winner." (E-E-T)
Surely this must be EJECT, but, if so,
where does the Wimbledon winner
come into it?